Excavating-bucket-forming machine



April 30, 1929. A. J. JACOBSENl l EXCAVATING BUCKET FORMING MACHINEFiled Jan. 3l, 1927 2 Sheets-Sheet a: n. ..4 v N APll 30, 1929- A. J.JAcoBsEN 1,710,985

EXCAVATING BUCKET FORMING MACHINE led Jan. s1. 1927 2 sheets-sneer 2 EPatented Apr. 3o, 1929.

UNITED STATES PATENT OFFICE.

ARTHUR J. JA'coBsEN, or CHICAGO, ILLIN ors, AssreNoa, BY MESNEASSIGNMENTS,

' PQRATION 0F ILLINOIS.

EXCAVATING-BUCKET-FORMING MACHINE.

Appucation 1aed January s1, 1927. semi No. 164,819.

This invention relates to a machine and method for forming the bucketsof excavating machines.

In the manufacture of heavy buckets of the character which may be formedby the apparatus herein described, it has been customary to make upbuckets by riveting togetherv a plurality of suitably .cut and formedsteel plates Jfor the bottom, sides and ends of the bucket rather thanto form the buckets from a single blank, due to the fact that formingmachines now available are not well adapted for bending blanks into thepeculiar .formaltion required in the` bucket. 'l he object of thepresent invention is to provide a machine and method which aresuitablefor bendinga single cut blank into the shape required forforming the bottom sides and end of the bucket.-

An illustrative embodiment of n a blank adaptablefor use, and `of amachine capable of readily carrying out the improved method of formingsuch excavating` trated in the accompanying drawings, wherein: y

Figure l is a front elevationy of the machine, the side forming membersthereof be ing also shown in a different position in dotted lines. A y 1Fig. 2 is a side elevation of the machine,

the side` tori'nmg members being shown inl lifted position. j y

Fig. 3 is a plan view of a sheetmetal'blank which is formed into anexcavatingbucket by the machine. i f r Fig. 4 is a plan view of a yokeused in forming the end of the excavating bucket.

In carrying out the present invention, a single suitablyfcut steelplate, for example, one-half inch in thickness, is placed upon ananchored form and secured therein by clamp# ing means which, if desired,may serve to somewhat curve the plate along a center line thereof incase such curvature is desired at the bottom of the finished bucket,Then the sides ofA the bucket are brought into the proper relationshipwith thek bottom by alifting action on wings of the unbent blank.Another projecting part of the bla'nkis rolled upwardly into position toformthe curved back .of the bucket. The sides and back of the bucket arethen securedin this position by angle irons riveted thereto.

buckets is illus The machine and method provide a simple means ofbending a plate metal blank into the ultimateform of the bucket.

A steel plate blank l from which the bucket is formed comprises the ears2 with their helices 3, lobes 4L and the integral medial porvtion 5vwhose head 6 projects considerably past said helices. The blank has aplurality of marginal rivet apertures 7. The medial portion of theblankis provided with dual apertures 8 and other apertures 9 near theinner edges of the ears. Eachear hasan aperture l0 equidistantfrom themarginal edge of the helix of each ear. j

In the construction illustrated in the accompanying drawings a fixedbase member 11, such as steel plating, is rigidly secured to the upperends of a plurality of I-beams 1'2, the lower endsrofI which areembedded in a concrete 'foundation 13. y j

The formingmachine has a pairV of tem-V plets or dies 15 having inwardlydeclining surfaces 16 adapted to support the medial portion of theblank.

A clamping bar 17 isvdisposed longitudinally with respect to the lengthof themedial rportion of the blank and has apertures 1S which registerwith the dual apertures -the blank. Bolts l9,owl1ose heads 2() are fastSof with the fixed base 1.1 project upwardly and u are positioned toregisterwith the apertures S in the. blankand the apertures 18 inv theclan'iping-bar. T he blank is placed upon thc tcniplets 153 inamannerwhereby the upwardly projecting bolts 19 project through the registering`apertures 8 and the clamping is then similarly placed up on the blank.The nuts 21 are thenk tightened to effect ther concave surface 2Q of themedial portion of the blank. A second pair of templets 23 have undersurfaces 24 corresponding in contour to the upper surfaces I6 ofthetemplets 15.

kEach set of templets" 23 has Vregistering apertures 24 which likewiseregister with the apertures in the blank. Bolts 25 are passed throughthese apertures and the nuts Z6 are used to secure the templjet setstogether.Y A.

spreader 27 is used to retain the telnplet pairs in properly spacedrelation.

A pair of laterally disposed wingslQS are hinged to the fixed base 11through the medium of the brackets 29 secured to the fixed bar base bythe bolts 30. Each wing has a pair ot levers 3l rigidly secured thereto,as by the rivets 32, the inner ends of said levers being ifixed4 apartadjacent the hinged side of the wings. rlfhe outer ends of the leversapproach each other and carry a pulley 33 therebetween. Cables 34 arecarried on said pulleys and suitable power, such as a lifting crane (notshown) may be hooked np with said cables .tor drawing the wings upwardlyto forni the sides 35 of the bucket. It will be noted that the templets:23 have arcuate outer sides 3G. In forming the sides of the bucket, theears ot the blank may be bent past the perpendicular in order that thesides, in their 'tei'ideiicii to springl back, mayV spring backsubstaiitially perpendicularly. n

In Yloi-ming the end 37 of the bucket, .a yoke S38 carrying a transverseroller 39 is Vdetachably secured to the formed side members by passingpins Ll through the apertures l() which` register with the apertures 4lat the ends oiE the yok. In securing the yoke to the sides of thebucket, the roller 39 is disposed under the inner end of the part 6 ofthe blank. The head oi. the yoke carries a pulley 42 and a cable 43 runson the pulley. Suitable power may bevexerted on the cable for liftingthe yoke whose roller thereby 'forms the end oi the bucket by curvingthe part G, the axis ot the curve being at pins i-O. Gussets or arcuateangle iron reinforcing means are used to connect the meeting edges ofthesides and end of the bucket.` Y

The fixed base 1l is provided with a series oi scaled apertures wherebythe templets and Q3, and brackets 29 may be laterally shitted so thatbuckets of various sizes may be formed.

Vilhile but one specific embodiment ot this invention has been hereinshown and described'` it will beunderstood that numerous details of theconstruction shown may be altered or omitted without departing trom thespirit ot this invention as defined by the following claims.

I claim:

l.' In a machine ot the character described, a base having` a member forreceiving a plate metal blank thereon, a second member `in clampingrelation to said first member and tor securing said blank in positiontherebetween, a forming member hinged to said base `member for bending aside ot said blank, and

a pivoted yoke carrying a cross member and arranged to be detachablymounted on the bent sides of said blank for curving another sidethereof.

2. In a machine of the character described, a base member, templetsdetachably secured to said base `member and a plate metal blanktherebetween, a pair of laterally disposed wings hinged to oppositesides of said base member for bending opposite sides of said blank, anda yoke carrying a transverse roller and arranged to be detachablypivoted to the bent opposite `sides of said blank and for forming theend` of said blank by means of said roller.

3. In a machine for forming excavating` buckets from metal blanks, aVfixed base menibei', templets detachably secured to said base memberand for securing a blank therebetween, a pair of laterally disposedwings detachably and liingedly secured to said base member for forming'the sides of said bucket, and a pivot-ed yoke carrying a cross memberfor forming the end of said bucket.

4. In a machine of the character described a base member, means on saidbase member for1 bending opposite sides of a blank, and a yoke carrying'a cross member and erranti d to bedetachably pivoted to the bentopposite sides oi: said blank for forming the end thereot by means ofsaid cross member.

5. In a machine etv the character described a base member, upper andlower dies detachably mounted on s aid base member. means for clampingthe blank between the upper and lower dies, forming mechanism on thebase member `for bending the opposite sides offsaid blank relative tothe dies, and means arranged to be pivoted to the opposite sidesoii saidblank for `forming the end thereof.

6. In a machine of the character described, a base member, a pair ofspaced apart die elements on said base member, means secured to the basemember between said die elements 'for clamping the blank to the uppersurface thereof, a pair oiLl spaced ripper die elements engaging theupper surface of said blank. a .spacing member extending between theupper die elements retaining the saine in spaced relation. a clampingmeans comprising bolts extending 'tl'iroiigh registering apertures inthe base, the dies and the l lank 'l'or securing the upper die elementsto the blank to provide bearing means for the sides of the blank duringbending thereof.

Signed at Chicago this 27th day of January, 1927.

. ARTHUR J. VV.IACOBSE1`T-V

